"We were asked by Spanish and UK specialists if we are ready and how the transportation will be provided.

"We told them we are ready and we can arrange it. If the court allows it and the parents agree with the treatment we can transport them here."

The centre claimed it had been sent Ashya's medical records and believed the technique was suitable for him.

A fundraising page set up to help pay for the treatment has so far raised more than £41,000, while charity Kids'n'Cancer UK said they have agreed to pay the £100,000 needed for Ashya's treatment, plus living costs, after donors pledged £35,000 in 24 hours.

Sky News understands a High Court judge may rule on the legal status of the boy before a formal hearing on Monday - if all sides can agree to the next steps.

They have been involved in discussions today and Ashya's family have apparently submitted plans to the court.

His father Brett King has hit out at the authorities' response after he and his wife removed him from hospital, saying they had been "treated like terrorists".

He claimed he had informed the hospital about their plans to take Ashya abroad for proton beam therapy, which was not available to him on the NHS. But he did not give a date for fear they would be stopped.

Southampton General told Sky News the family had made it clear they wanted to take Ashya to Prague, but staff were taken completely by surprise when it happened.

Dr Peter Wilson, chief paediatrician, said Mr and Mrs King were not keen on parts of the treatment which had been suggested, and there had been discussions about alternative therapies.

He added the hospital had "absolutely not" threatened them with an order which would have taken away their right to make decisions about Ashya's care.